Fixes missing trailing NULL in the spawnlp() parameters.
Essential for Windows version only.
Use like this:

shell$ patch -d gnuitar-0.3.1 -p1 <patch1

--- gnuitar-0.3.1/gui.c	Wed Apr 16 21:42:58 2003
+++ gnuitar-current/gui.c	Thu May  1 22:09:25 2003
@@ -17,9 +17,12 @@
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  *
- * $Id: gui.c,v 1.20 2003/04/16 18:42:58 fonin Exp $
+ * $Id: gui.c,v 1.21 2003/05/01 19:09:25 fonin Exp $
  *
  * $Log: gui.c,v $
+ * Revision 1.21  2003/05/01 19:09:25  fonin
+ * Bugfix with spawnl() syntax - the last parameter always should be NULL.
+ *
  * Revision 1.20  2003/04/16 18:42:58  fonin
  * R_OK macro definition moved to utils.h.
  *
@@ -336,7 +339,7 @@
 	}
     }
     if (strcmp(path, "") != 0) {
-	if (spawnlp(P_NOWAIT, "start", "start", path) == -1) {
+	if (spawnlp(P_NOWAIT, "start", "start", path, NULL) == -1) {
 	    perror("spawn");
 	}
     }